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The letter should have had the code on it, the code is vehicle specific and the disc will only work in the unit it is programmed to. If Here did not send you the code You will need to call them and have them give it to you they are the only ones that have access to their software. their number is 1(###) ###-####/p>
The code you need is the long set of numbers, you enter it the same way as the radio code. Then the disc will run for about 3 hours to reprogram the navigation system. Be sure to leave the vehicle running in a safe place while it updates.
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press and hold the power button for 10 seconds and see if it comes on.